jQuery+PHP+MySQL achieves infinite cascading drop-down box effect

jQuery+PHP+MySQL achieves infinite cascading drop-down box effect_jquery

WBOY

Release： 2016-05-16 15:14:49

Original

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This article simply implements the infinite cascading effect of jQuery and shares it with everyone for your reference. The specific content is as follows
Rendering:

　Picture 1 drop-down box only

Figure 2 Level prompt + drop-down box

Figure 3 Storage data click response

Mainly contains 3 files: index.html (home page), wuxianjilian.php (data processing), wuxianjilian.sql (MySQL data file)
1. index.html

<html>
<head>
  <title>无限级联</title>
  <meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
  <meta http-equiv="Content-Language" content="zh-CN" />
  <script type="text/javascript" src="http://files.cnblogs.com/Zjmainstay/jquery-1.6.2.min.js"></script>
</head>
<body>
<div id="jilianContainer"></div>
<script type="text/javascript">
$(document).ready(function(){
  var getData = function(obj){
    $.ajax({
      url:'wuxianjilian.php',
      type:'POST',
      data:{"pid":obj.val()},
      dataType:'json',
      async:false,
      success:function(data){
        if($(".selection").length){
          $(".selection:gt("+$(obj).index()+")").remove();  //移除后面所有子级下拉菜单
          $(".selection:last").after(data);          //添加子级下拉菜单
        }else {
          $("#jilianContainer").append(data);          //初始加载情况
        }
        //所有下拉响应
        $(".selection").unbind().change(function(){
          getData($(this));
        });
      },
      error:function(msg){
        alert('error');
      }
    });
  }
  
  //Init
  getData($(this));
  
});
</script>

<!-- 数据存储示例，仅提取数据，不做操作 -->

<div style="height:100px;display:block;"></div>
<input type="button" value="存储数据" id="save"></input>
<script type="text/javascript">
$(document).ready(function(){
  $("#save").click(function(){
    var data = [];
    $(".selection").each(function(){
      data.push($.trim($(this).val()));
    })
    
    alert(data.join(','));
  });
});
</script>

</body>
</html>

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2. wuxianjilian.php

<&#63;php
  header("Content-type: text/html; charset=utf-8"); 

  //数据库连接操作
  $conn = mysql_connect("localhost","Zjmainstay","") or die("Can not connect to database.Fatal error handle by ". __FILE__);
  mysql_select_db("test",$conn);      //数据库名为 test
  mysql_query("SET NAMES utf8",$conn);
  
  //获取父级id
  $pid = (int)$_POST['pid'];
  
  //查询子级
  $sql = "SELECT id,text FROM `wuxianjilian` WHERE pid={$pid}";
  $result = mysql_query($sql,$conn);
  
  //组装子级下拉菜单
  $html = '';
  while($row = mysql_fetch_assoc($result)){
    $html .= '<option value="'.$row['id'].'">'.$row['text'].'</option>';
  }

  if(!empty($html)) $html = '<select class="selection"><option value="">请选择</option>' . $html . '</select>';
  
  //输出下拉菜单
  echo json_encode($html);
//End_php

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3. wuxianjilian.sql

wuxianjilian.sql
/*
Navicat MySQL Data Transfer

Source Server     : localhost
Source Server Version : 50516
Source Host      : localhost:3306
Source Database    : test

Target Server Type  : MYSQL
Target Server Version : 50516
File Encoding     : 65001

Date: 2012-10-24 20:59:09
*/

SET FOREIGN_KEY_CHECKS=0;
-- ----------------------------
-- Table structure for `wuxianjilian`
-- ----------------------------
DROP TABLE IF EXISTS `wuxianjilian`;
CREATE TABLE `wuxianjilian` (
 `id` int(11) NOT NULL AUTO_INCREMENT,
 `pid` int(11) DEFAULT NULL,
 `text` varchar(32) DEFAULT NULL,
 PRIMARY KEY (`id`)
) ENGINE=InnoDB AUTO_INCREMENT=22 DEFAULT CHARSET=utf8;

-- ----------------------------
-- Records of wuxianjilian
-- ----------------------------
INSERT INTO `wuxianjilian` VALUES ('1', '0', 'A0');
INSERT INTO `wuxianjilian` VALUES ('2', '0', 'B0');
INSERT INTO `wuxianjilian` VALUES ('3', '1', 'C1');
INSERT INTO `wuxianjilian` VALUES ('4', '1', 'D1');
INSERT INTO `wuxianjilian` VALUES ('5', '1', 'E1');
INSERT INTO `wuxianjilian` VALUES ('6', '2', 'F2');
INSERT INTO `wuxianjilian` VALUES ('7', '2', 'G2');
INSERT INTO `wuxianjilian` VALUES ('8', '3', 'H3');
INSERT INTO `wuxianjilian` VALUES ('9', '3', 'I3');
INSERT INTO `wuxianjilian` VALUES ('10', '3', 'J3');
INSERT INTO `wuxianjilian` VALUES ('11', '3', 'K3');
INSERT INTO `wuxianjilian` VALUES ('12', '4', 'L4');
INSERT INTO `wuxianjilian` VALUES ('13', '4', 'M4');
INSERT INTO `wuxianjilian` VALUES ('14', '8', 'N8');
INSERT INTO `wuxianjilian` VALUES ('15', '9', 'N9');
INSERT INTO `wuxianjilian` VALUES ('16', '14', 'O14');
INSERT INTO `wuxianjilian` VALUES ('17', '14', 'P14');
INSERT INTO `wuxianjilian` VALUES ('18', '14', 'Q14');
INSERT INTO `wuxianjilian` VALUES ('19', '17', 'R17');
INSERT INTO `wuxianjilian` VALUES ('20', '17', 'S18');
INSERT INTO `wuxianjilian` VALUES ('21', '20', 'T20');

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I hope this article will be helpful to everyone learning jquery programming.